Shelf



FIG. 1 is a front perspective view of a shelf;

FIG. 2 is a back perspective view of the shelf of FIG. 1;

FIG. 3 is a top plan view of the shelf of FIG. 1;

FIG. 4 is a front elevation view of the shelf of FIG. 1;

FIG. 5 is a bottom plan view of the shelf of FIG. 1;

FIG. 6 is a back elevation view of the shelf of FIG. 1;

FIG. 7 is a left side elevation view of the shelf of FIG. 1; and,

FIG. 8 is a right side elevation view of the shelf of FIG. 1.

The broken line showing in the figures is included for the purpose of illustrating portions of the shelf and form no part of the claimed design. 

CLAIM The ornamental design for a shelf, as shown and described. 